Manage project security

updated: 2021-04-10 07:30

Manage project security¶

Security groups are sets of IP filter rules that are applied to all project instances, which define networking access to the instance. Group rules are project specific; project members can edit the default rules for their group and add new rule sets.

All projects have a default security group which is applied to any instance that has no other defined security group. Unless you change the default, this security group denies all incoming traffic and allows only outgoing traffic to your instance.

You can use the allow_same_net_traffic option in the /etc/nova/nova.conf file to globally control whether the rules apply to hosts which share a network. There are two possible values:

True (default): Hosts on the same subnet are not filtered and are allowed to pass all types of traffic between them. On a flat network, this allows all instances from all projects unfiltered communication. With VLAN networking, this allows access between instances within the same project. You can also simulate this setting by configuring the default security group to allow all traffic from the subnet.
False: Security groups are enforced for all connections.

Additionally, the number of maximum rules per security group is controlled by the security_group_rules and the number of allowed security groups per project is controlled by the security_groups quota (see Manage quotas).

List and view current security groups¶

From the command-line you can get a list of security groups for the project, using the openstack and nova commands:

Ensure your system variables are set for the user and project for which you are checking security group rules. For example:
```
export OS_USERNAME=demo00
export OS_TENANT_NAME=tenant01
```

Output security groups, as follows:

$ openstack security group list
+--------------------------------------+---------+-------------+
| Id                                   | Name    | Description |
+--------------------------------------+---------+-------------+
| 73580272-d8fa-4927-bd55-c85e43bc4877 | default | default     |
| 6777138a-deb7-4f10-8236-6400e7aff5b0 | open    | all ports   |
+--------------------------------------+---------+-------------+

View the details of a group, as follows:

$ openstack security group rule list GROUPNAME

For example:

$ openstack security group rule list open
+--------------------------------------+-------------+-----------+-----------------+-----------------------+
| ID                                   | IP Protocol | IP Range  | Port Range      | Remote Security Group |
+--------------------------------------+-------------+-----------+-----------------+-----------------------+
| 353d0611-3f67-4848-8222-a92adbdb5d3a | udp         | 0.0.0.0/0 | 1:65535         | None                  |
| 63536865-e5b6-4df1-bac5-ca6d97d8f54d | tcp         | 0.0.0.0/0 | 1:65535         | None                  |
+--------------------------------------+-------------+-----------+-----------------+-----------------------+

These rules are allow type rules as the default is deny. The first column is the IP protocol (one of ICMP, TCP, or UDP). The second and third columns specify the affected port range. The third column specifies the IP range in CIDR format. This example shows the full port range for all protocols allowed from all IPs.

Create a security group¶

When adding a new security group, you should pick a descriptive but brief name. This name shows up in brief descriptions of the instances that use it where the longer description field often does not. For example, seeing that an instance is using security group "http" is much easier to understand than "bobs_group" or "secgrp1".

Ensure your system variables are set for the user and project for which you are creating security group rules.

Add the new security group, as follows:

$ openstack security group create GroupName --description Description

For example:

$ openstack security group create global_http --description "Allows Web traffic anywhere on the Internet."
+-----------------+--------------------------------------------------------------------------------------------------------------------------+
| Field           | Value                                                                                                                    |
+-----------------+--------------------------------------------------------------------------------------------------------------------------+
| created_at      | 2016-11-03T13:50:53Z                                                                                                     |
| description     | Allows Web traffic anywhere on the Internet.                                                                             |
| headers         |                                                                                                                          |
| id              | c0b92b20-4575-432a-b4a9-eaf2ad53f696                                                                                     |
| name            | global_http                                                                                                              |
| project_id      | 5669caad86a04256994cdf755df4d3c1                                                                                         |
| project_id      | 5669caad86a04256994cdf755df4d3c1                                                                                         |
| revision_number | 1                                                                                                                        |
| rules           | created_at='2016-11-03T13:50:53Z', direction='egress', ethertype='IPv4', id='4d8cec94-e0ee-4c20-9f56-8fb67c21e4df',      |
|                 | project_id='5669caad86a04256994cdf755df4d3c1', revision_number='1', updated_at='2016-11-03T13:50:53Z'                    |
|                 | created_at='2016-11-03T13:50:53Z', direction='egress', ethertype='IPv6', id='31be2ad1-be14-4aef-9492-ecebede2cf12',      |
|                 | project_id='5669caad86a04256994cdf755df4d3c1', revision_number='1', updated_at='2016-11-03T13:50:53Z'                    |
| updated_at      | 2016-11-03T13:50:53Z                                                                                                     |
+-----------------+--------------------------------------------------------------------------------------------------------------------------+

Add a new group rule, as follows:

$ openstack security group rule create SEC_GROUP_NAME \
    --protocol PROTOCOL --dst-port FROM_PORT:TO_PORT --remote-ip CIDR

The arguments are positional, and the from-port and to-port arguments specify the local port range connections are allowed to access, not the source and destination ports of the connection. For example:

$ openstack security group rule create global_http \
    --protocol tcp --dst-port 80:80 --remote-ip 0.0.0.0/0
+-------------------+--------------------------------------+
| Field             | Value                                |
+-------------------+--------------------------------------+
| created_at        | 2016-11-06T14:02:00Z                 |
| description       |                                      |
| direction         | ingress                              |
| ethertype         | IPv4                                 |
| headers           |                                      |
| id                | 2ba06233-d5c8-43eb-93a9-8eaa94bc9eb5 |
| port_range_max    | 80                                   |
| port_range_min    | 80                                   |
| project_id        | 5669caad86a04256994cdf755df4d3c1     |
| project_id        | 5669caad86a04256994cdf755df4d3c1     |
| protocol          | tcp                                  |
| remote_group_id   | None                                 |
| remote_ip_prefix  | 0.0.0.0/0                            |
| revision_number   | 1                                    |
| security_group_id | c0b92b20-4575-432a-b4a9-eaf2ad53f696 |
| updated_at        | 2016-11-06T14:02:00Z                 |
+-------------------+--------------------------------------+

You can create complex rule sets by creating additional rules. For example, if you want to pass both HTTP and HTTPS traffic, run:

$ openstack security group rule create global_http \
    --protocol tcp --dst-port 443:443 --remote-ip 0.0.0.0/0
+-------------------+--------------------------------------+
| Field             | Value                                |
+-------------------+--------------------------------------+
| created_at        | 2016-11-06T14:09:20Z                 |
| description       |                                      |
| direction         | ingress                              |
| ethertype         | IPv4                                 |
| headers           |                                      |
| id                | 821c3ef6-9b21-426b-be5b-c8a94c2a839c |
| port_range_max    | 443                                  |
| port_range_min    | 443                                  |
| project_id        | 5669caad86a04256994cdf755df4d3c1     |
| project_id        | 5669caad86a04256994cdf755df4d3c1     |
| protocol          | tcp                                  |
| remote_group_id   | None                                 |
| remote_ip_prefix  | 0.0.0.0/0                            |
| revision_number   | 1                                    |
| security_group_id | c0b92b20-4575-432a-b4a9-eaf2ad53f696 |
| updated_at        | 2016-11-06T14:09:20Z                 |
+-------------------+--------------------------------------+

Despite only outputting the newly added rule, this operation is additive (both rules are created and enforced).

View all rules for the new security group, as follows:

$ openstack security group rule list global_http
+--------------------------------------+-------------+-----------+-----------------+-----------------------+
| ID                                   | IP Protocol | IP Range  | Port Range      | Remote Security Group |
+--------------------------------------+-------------+-----------+-----------------+-----------------------+
| 353d0611-3f67-4848-8222-a92adbdb5d3a | tcp         | 0.0.0.0/0 | 80:80           | None                  |
| 63536865-e5b6-4df1-bac5-ca6d97d8f54d | tcp         | 0.0.0.0/0 | 443:443         | None                  |
+--------------------------------------+-------------+-----------+-----------------+-----------------------+

Delete a security group¶

Ensure your system variables are set for the user and project for which you are deleting a security group.

Delete the new security group, as follows:

$ openstack security group delete GROUPNAME

For example:

$ openstack security group delete global_http

Create security group rules for a cluster of instances¶

Source Groups are a special, dynamic way of defining the CIDR of allowed sources. The user specifies a Source Group (Security Group name), and all the user's other Instances using the specified Source Group are selected dynamically. This alleviates the need for individual rules to allow each new member of the cluster.

Make sure to set the system variables for the user and project for which you are creating a security group rule.

Add a source group, as follows:

$ openstack security group rule create secGroupName \
    --remote-group source-group --protocol ip-protocol \
    --dst-port from-port:to-port

For example:

$ openstack security group rule create cluster \
    --remote-group global_http --protocol tcp --dst-port 22:22

The cluster rule allows SSH access from any other instance that uses the global_http group.

updated: 2021-04-10 07:30

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